My Rotel RP-850 belt drive, full manual tt creates a loud pop in my speakers every time it's powered down and occasionally when powered up too.
It started as an intermittent problem when turning the power off, most of the time it would pop but then other times it wouldn't. Sometimes I would also hear a pop when I turned it on but much less often.
Today I decided to start using my NAD PP 3i phono preamp again because it better matches the loading for my cartridge. Now the problem occurs every time it's powered down and it's much louder! It does not send my power amp into protect mode though.
It also occurs a lot more often when turned on, but it's a much quieter pop. It seems unaffected by turning the volume down, and to occur at all frequencies because if I turn the speakers off I still hear it in my sub.